EP0038958B1 - Système de purge pour installation frigorifique - Google Patents

Système de purge pour installation frigorifique Download PDF

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Publication number
EP0038958B1
EP0038958B1 EP81102542A EP81102542A EP0038958B1 EP 0038958 B1 EP0038958 B1 EP 0038958B1 EP 81102542 A EP81102542 A EP 81102542A EP 81102542 A EP81102542 A EP 81102542A EP 0038958 B1 EP0038958 B1 EP 0038958B1
Authority
EP
European Patent Office
Prior art keywords
purge chamber
purge
refrigerant
pressure
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81102542A
Other languages
German (de)
English (en)
Other versions
EP0038958A2 (fr
EP0038958A3 (en
Inventor
Kenneth P. Gray
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Corp
Original Assignee
Carrier Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carrier Corp filed Critical Carrier Corp
Publication of EP0038958A2 publication Critical patent/EP0038958A2/fr
Publication of EP0038958A3 publication Critical patent/EP0038958A3/en
Application granted granted Critical
Publication of EP0038958B1 publication Critical patent/EP0038958B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/04—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for withdrawing non-condensible gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/04—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for withdrawing non-condensible gases
    • F25B43/043—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for withdrawing non-condensible gases for compression type systems

Definitions

  • This invention relates to a refrigeration purging system and process and in particular to a system designed to remove non-condensibles and contaminants which collect within the refrigeration system.
  • Non-condensible gases and contaminants become mixed with the refrigerant and tend to collect at some point such as the top of the condenser.
  • the presence of non-condensibles and contaminants in the system reduces the efficiency of the system since they necessitate higher condenser pressure with accompanying increases in power cost and cooling water consumption.
  • the capacity of the system is also reduced since the non-condensible gases displace refrigerant vapor.
  • Purging devices of various types have been used to remove or purge the non-condensibles and contaminants from the system. Such devices normally include a purge chamber for collecting the non-condensibles, such as air and other non-condensible gases, and expelling them to the atmosphere.
  • the gases which collect in the purge chamber also include water vapor and portions of the refrigerant vapor.
  • a heat transfer coil located within the purge chamber is supplied with a cold water or cool liquid refrigerant and operates as a condensing coil to condense the refrigerant and water vapor to a liquid.
  • the condensible gaseous constituents such as refrigerant and water are removed from the chamber and then recirculated to the refrigeration system or expelled from the system.
  • the non-condensible gases are usually vented to the atmosphere by a pump which operates in response to the pressure differential between the purge chamber and the refrigerant condenser.
  • Refrigeration purge systems are known in the art and U.S. Patent 4,169,356 and Swiss Patent 390,294 are concerned with such systems.
  • the present invention provides a substantial advantage over prior art systems of the type disclosed in U.S. Patent 4,169,356 and Swiss Patent 390,294. Although these prior patents disclose the provision of primary and secondary systems, neither is capable of providing optimal automatic removal of non-condensibles and other contaminants from the overall refrigeration system.
  • the present invention makes this possible and achieves this advantage by providing two chambers which are coordinated in operation so that a secondary purge chamber has a selected higher condensing pressure and a selective lower condensing temperature relative to the condensing pressure and temperature in a main purge chamber.
  • a purge system for removing non-condensible vapors from a refrigeration system, said purge system including a first purge chamber having a first condensing coil a second purge chamber having a second condensing coil, a supply for refrigerant vapor and non-condensible gases from the refrigeration system to the first purge chamber, a pump arranged to pump refrigerant vapors and non-condensible gases from the first purge chamber into the second purge chamber at a higher pressure than the vapor in the first purge chamber, and a controlled outlet for exhausting non-condensible gases from the second purge chamber, characterized by a switch operable to activate the pump to pump refrigerant vapors and non-condensible gases at a selected higher pressure to the second purge chamber in response to a rise in pressure in the first purge chamber, a conduit for returning condensed refrigerant from the second purge chamber to the first purge chamber, a valve for automatically restrict
  • FIG. 1 a typical refrigeration system is shown in which refrigerant is compressed by a compressor 10.
  • a condenser 12 is provided with a float chamber 14 which supplies liquid refrigerant to a conduit 16 to connect the condenser outlet and the inlet of an evaporator 18.
  • Evaporated refrigerant is discharged from the evaporator 18 through a conduit line 20 to the suction of the compressor 10.
  • a main purge chamber 26 is provided for this purpose.
  • the purge chamber 26 is connected with the upper part of the condenser 12 by a conduit line 28 for extracting the gaseous mixture from the condenser and conveying it to the purge chamber.
  • Conduit line 28 has an orifice 30 to regulate the flow of vapor between the condenser and the purge chamber.
  • a condensing coil 36 is located in the top portion of the purge chamber 26 to receive cool fluid and condense the refrigerant vapors.
  • a secondary purge chamber 38 is provided in the system having a second condensing coil 34.
  • the condensing coil 34 may be connected with the condensing coil 36 in the main purge chamber so that the same liquid coolant may flow through both coils.
  • Coil 34 receives cool fluid from either an external water supply or from the evaporator 18 or from a separate refrigeration system.
  • An orifice 39 is provided in the line to coil 34 to reduce the refrigerant pressure when liquid refrigerant is supplied from evaporator 18 or from a separate refrigeration system.
  • the refrigerant in the main purge chamber 26 In the main purge chamber 26 cold liquid entering the coil 36 is circulated through the coil to drop the temperatures of the vaporous mixture of refrigerant, non-condensibles and contaminants collected in purge chamber 26. As the temperature around the coil 36 is decreased, the refrigerant in the main purge chamber will be condensed. In operation, the refrigerant gas is condensed continuously and falls to the bottom of the purge chamber 26. Light foreign condensibles such as water collect as a layer on top of the relatively pure liquid refrigerant. Arranged within the purge chamber 26 is a conventional float valve 40 to control the level of liquid refrigerant.
  • the float valve automatically opens to discharge pure liquid refrigerant from the chamber to the evaporator through line 42. As the liquid level drops below a predetermined level, the float valve closes.
  • a side wall of the purge chamber is provided with a sight glass 44 which permits one to determine by visual observation the level of water within the chamber.
  • a manual valve 46 is arranged on the side wall of the chamber to drain off the accumulated water.
  • the non-condensibles, such as air, and the remaining portion of the refrigerant which was not condensed in the purge chamber 26 collects in the upper part of the main purge chamber. As the non-condensible gases accumulate the pressure in the chamber rise.3 approaching the pressure of the vapor and gas from the condenser.
  • a pump 50 is provided in the system connected with the purge chamber 26 by a line 52.
  • the motor of the pump 50 is located in an electrical circuit which includes control means containing a differential pressure switch 48, a pressure switch 62, an exhaust solenoid valve 64 and a drain solenoid valve 66.
  • the pressure differential switch 48 has normally open contacts which close when the pressure in purge chamber 26, as measured by a sampling line 51 from the switch to the main purge chamber, approaches the pressure in the line 28, ahead of the orifice 30.
  • the pressure in line 28 is measured by a sampling line 53 which extends between the switch 48 and line 28 ahead of the orifice 30.
  • the secondary purge chamber 54 is arranged in the system.
  • Pump 50 is connected to an inlet of the secondary purge chamber 38 by a conduit line 60.
  • a conventional pressure switch 62 is arranged in the conduit line 60 between pump 50 and the inlet of purge chamber 38, and a conventional solenoid valve 64 is provided between purge chamber 38 and a discharge line 70 leading to the atmosphere.
  • the solenoid portion of valve 64 is connected in the electrical circuit with pressure switch 62.
  • a normally open drain solenoid 66 is located in a conduit line 72 connecting the outlet of purge chamber 38 with main purge chamber 26.
  • high pressure vapor from the condenser is introduced to the main purge chamber 26 through line 28 wherein it is cooled by the heat exchange coil 36.
  • Condensible constituents of the entering gas are liquefied, collected at the bottom of the purge chamber 26 and drained out of the purge chamber back to the refrigeration system through line 42 by operation of float valve 40.
  • Water which has been condensed from the entering vapor accumulates in the bottom of the purge chamber and is drained off by manual valve 46.
  • the non-condensible gases and that portion of condensible refrigerant which has not condensed in the purge chamber 26 collects at the top of the chamber. As non-condensible gases build up in the main purge .
  • the coolant flowing through the coil 34 will absorb heat from the gaseous mixture and a portion of the condensible refrigerant which was not condensed in purge chamber 26 will be condensed in the purge chamber 38 and collect at the bottom of the chamber. Since the condensing pressure is higher in the purge chamber 38 than in the purge chamber 26 and the temperature of coil 34 is lower than coil 36 more refrigerant is condensed from the vapor and less refrigerant goes to the atmosphere when the non-condensed portion is purged from the chamber. As the refrigerant and non-condensibles are pumped into conduit line 60, pressure switch 62, which can be set to operate at any given pressure closes, when a predetermined pressure is reached in the line 60.
  • the closed contacts of the switch 62 energize solenoid valve opening the valve 64 and permitting non-condensed vapor to exhaust to the atmosphere through line 70.
  • solenoid valve opening the valve 64 and permitting non-condensed vapor to exhaust to the atmosphere through line 70.
  • pressure in the purge chamber drops and pressure differential switch 48 opens.
  • the purge cycle is completed.
  • the pump stops and drain solenoid valve 66 opens permitting the condensate to flow out of the purge chamber 38 through line 72 to the purge chamber 26.
  • the condensate from chamber 38 is mixed with the refrigerant condensed in the purge chamber 26 and is returned to the refrigeration system.
  • a second embodiment of the invention is illustrated in Figure 2 and involves a simplification of the means for removing the non-condensibles from the purge chamber 38 and means for connecting the outlet of purge chamber 38 with purge chamber 26.
  • a pressure relief valve 80 is employed in place of exhaust solenoid valve 64.
  • the valve 80 is responsive to pressure in line 60 such that it opens upon a rise of pressure above a preset value and closes upon a decrease of pressure below the present value.
  • the pressure in the line 60 exceeds the set value of relief valve 80 the latter opens and allows the non-condensibles to flow from the upper portion of purge chamber 38 through line 70 to the atmosphere.
  • the relief valve will remain open until pressure in line 60 drops.
  • an orifice 82 is arranged in line 72 in place of drain solenoid valve 66 shown in Figure 1. Orifice 82 is small enough to maintain pressure in the purge chamber 38 and to allow liquid refrigerant condensed in purge chamber 38, to flow to the purge chamber 26.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Claims (3)

1. Système de purge pour l'élimination de vapeurs non condensables d'une installation frigorifique, ledit système de purge comprenant une première chambre de purge (26) possédant une premier serpentin de condensation (36), une seconde chambre de purge (38) possédant un second serpentin de condensation (34), un système d'amenée (28, 30) de la vapeur du réfrigérant et des gaz non condensables depuis l'installation frigorifique jusqu'à la première chambre de purge (26), une pompe (50) agencée de manière à pomper les vapeurs du réfrigérant et les gaz non condensables depuis la première chambre de purge (26) jusque dans la seconde chambre de purge (8) à une pression supérieure à la vapeur présente dans la première chambre de purge (26) et une sortie commandée (62, 64, 70) servant à évacuer des gaz non condensables de la seconde chambre de purge (38), caractérisé par un commutateur (38) pouvant agir de manière à actionner la pompe (50) en vue de pomper les vapeurs du réfrigérant et les gaz non condensables à une pression sélectionnée plus élevée que dans la seconde chambre de purge (38), en réponse à un accroissement de la pression dans la première chambre de purge (26), une canalisation (72) permettant de renvoyer le réfrigérant condensé depuis la seconde chambre de purge (38) jusque dans la première chambre de purge (26), une valve (66) servant à limiter de façon automatique le débit du fluide à travers la canalisation (72) reliant la seconde chambre de purge (38) à la première chambre de purge (26) lorsque la pression dans cette première chambre de purge (26) est supérieure à une limité prédéterminée, et à renvoyer de façon automatique le réfrigérant condensé depuis la seconde chambre de purge (38) jusqu'à la première chambre de purge (26) lorsque la pression régnant dans cette première chambre de purge (26) est inférieure à une limite prédéterminée, et une canalisation commandée (40, 42) servant à renvoyer le réfrigérant condensé depuis la première chambre de purge (26) jusqu'à l'installation frigorifique.
2. Système de purge selon la revendication 1, caractérisé en ce que la valve (66) est une électrovalve sensible, à des variations de la pression dans la première chambre de purge (26).
3. Système de purge selon la revendication 1, caractérisé en ce que les serpentins de condensation (36, 34) des première et seconde chambres de purge (26, 38) sont raccordés de manière à former un seul circuit pour la circulation d'un fluide caloporteur, le fluide traversant tout d'abord le second serpentin de condensation (34), puis le premier serpentin de condensation (36).
EP81102542A 1980-04-28 1981-04-03 Système de purge pour installation frigorifique Expired EP0038958B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US144139 1980-04-28
US06/144,139 US4304102A (en) 1980-04-28 1980-04-28 Refrigeration purging system

Publications (3)

Publication Number Publication Date
EP0038958A2 EP0038958A2 (fr) 1981-11-04
EP0038958A3 EP0038958A3 (en) 1982-04-14
EP0038958B1 true EP0038958B1 (fr) 1985-02-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP81102542A Expired EP0038958B1 (fr) 1980-04-28 1981-04-03 Système de purge pour installation frigorifique

Country Status (10)

Country Link
US (1) US4304102A (fr)
EP (1) EP0038958B1 (fr)
JP (2) JPS57466A (fr)
KR (1) KR850001258B1 (fr)
AU (1) AU540108B2 (fr)
BR (1) BR8102557A (fr)
CA (1) CA1139119A (fr)
DE (1) DE3168726D1 (fr)
IN (1) IN155638B (fr)
MX (1) MX152844A (fr)

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Publication number Priority date Publication date Assignee Title
DE102008007918A1 (de) 2008-02-06 2009-08-13 Putzmeister Concrete Pumps Gmbh Fahrbare Arbeitsmaschine
DE102008007917A1 (de) 2008-02-06 2009-08-13 Putzmeister Concrete Pumps Gmbh Fahrbare Arbeitsmaschine
CN106322804A (zh) * 2015-06-30 2017-01-11 开利公司 制冷系统及其净化方法

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US20130283832A1 (en) * 2012-04-30 2013-10-31 Trane International Inc. Refrigeration system with purge using enrivonmentally-suitable chiller refrigerant
US10190808B2 (en) 2012-04-30 2019-01-29 Trane International Inc. Refrigeration system with purge and acid filter
US8888898B1 (en) * 2012-07-30 2014-11-18 Google Inc. Vacuum filling and degasification system
US10584906B2 (en) 2013-08-09 2020-03-10 Carrier Corporation Refrigeration purge system
WO2015020719A1 (fr) 2013-08-09 2015-02-12 Carrier Corporation Système de purge pour système refroidisseur
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US11976860B2 (en) 2018-12-03 2024-05-07 Carrier Corporation Enhanced refrigeration purge system
WO2020117580A1 (fr) 2018-12-03 2020-06-11 Carrier Corporation Système de purge à membrane
US11911724B2 (en) 2018-12-03 2024-02-27 Carrier Corporation Enhanced refrigeration purge system
US11913693B2 (en) 2018-12-03 2024-02-27 Carrier Corporation Enhanced refrigeration purge system
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008007918A1 (de) 2008-02-06 2009-08-13 Putzmeister Concrete Pumps Gmbh Fahrbare Arbeitsmaschine
DE102008007917A1 (de) 2008-02-06 2009-08-13 Putzmeister Concrete Pumps Gmbh Fahrbare Arbeitsmaschine
CN106322804A (zh) * 2015-06-30 2017-01-11 开利公司 制冷系统及其净化方法

Also Published As

Publication number Publication date
IN155638B (fr) 1985-02-16
JPS6035015Y2 (ja) 1985-10-18
MX152844A (es) 1986-06-18
AU540108B2 (en) 1984-11-01
KR850001258B1 (ko) 1985-08-26
JPS57466A (en) 1982-01-05
KR830005553A (ko) 1983-08-20
EP0038958A2 (fr) 1981-11-04
DE3168726D1 (en) 1985-03-21
BR8102557A (pt) 1982-01-19
EP0038958A3 (en) 1982-04-14
CA1139119A (fr) 1983-01-11
US4304102A (en) 1981-12-08
JPS6016977U (ja) 1985-02-05
AU6987781A (en) 1981-11-05

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